Process for producing a hermetic electric compressor

Abstract

A process for producing a hermetic electric compressor for a refrigerating or air-conditioning apparatus using a refrigerant having a hydrofluorocarbon base which comprises a motor unit, a compressing unit driven by the motor unit and a sealed housing enclosing the motor unit and the compressing unit and stores a refrigeration oil on the bottom of the sealed housing, wherein a solventless varnish comprising a thermosetting resin having at least two (meth)acryloyl groups in one molecule, a low-viscosity vinyl or 1-alkylvinyl monomer having an ether or ester linkage as a reactive diluent and an organic peroxide as a reaction initiator is used as an insulating varnish to insulate and fix the magnet wires of the stator of the motor unit, and the solventless varnish is cured by heating at a temperature of from 153 to 180 DEG C. for from 0.5 to 3.5 hours.

What is claimed is: 
     
       1. A process for producing a hermetic electric compressor, which comprises a motor unit; a compressing unit driven by the motor unit; and a sealed housing enclosing a refrigeration oil on a bottom of the sealed housing, the motor unit and the compressing unit, the process comprising using a solventless varnish comprising a thermosetting resin having at least two (meth)acryloyl groups in each resin molecule;   a reactive diluent including a vinyl or 1-alkylvinyl monomer having an ether or ester linkage; and   a reaction initiator including an organic peroxide to insulate and fix magnet wires of a stator of the motor unit, and     curing the solventless varnish at a temperature of from 153° C. to 180° C. for 0.5 to 3.5 hours.   
     
     
       2. The process according to claim 1, wherein the reactive diluent further includes a polyfunctional vinyl monomer having at least three (meth)acryloyl or allyl groups. 
     
     
       3. The process according to claim 1, wherein the solventless varnish further comprises a metal salt of an organic acid. 
     
     
       4. The process according to claim 1, wherein the reaction initiator further includes a photo-initiator. 
     
     
       5. A hermetic electric compressor comprising a motor unit including magnet wires coated with a cured solventless varnish;   a compressing unit driven by the motor unit; and   a sealed housing enclosing a refrigeration oil on a bottom of the scaled housing, the motor unit and the compressing unit, wherein   the cured solventless varnish is produced by curing a solventless varnish comprising a thermosetting resin having at least two (meth)acryloyl groups in each resin molecule;   a reactive diluent including a vinyl or 1-alkylvinyl monomer having an ether or ester linkage; and   a reaction initiator including an organic peroxide.     
     
     
       6. The hermetic electric compressor according to claim 5, wherein the reactive diluent further includes a polyfunctional vinyl monomer having at least three (meth)acryloyl or allyl groups. 
     
     
       7. The hermetic electric compressor according to claim 5, wherein the solventless varnish further comprises a metal salt of an organic acid. 
     
     
       8. The hermetic electric compressor according to claim 5, wherein the reaction initiator further includes a photo-initiator. 
     
     
       9. A method of operating a refrigerating or air-conditioning apparatus, the method comprising using the hermetic electric compressor of claim 5 with a refrigerant having a hydrofluorocarbon base. 
     
     
       10. A method of operating a refrigerating or air-conditioning apparatus, the method comprising using the hermetic electric compressor of claim 6 with a refrigerant having a hydrofluorocarbon base. 
     
     
       11. A method of operating a refrigerating or air-conditioning apparatus, the method comprising using the hermetic electric compressor of claim 7 with a refrigerant having a hydrofluorocarbon base. 
     
     
       12. A method of operating a refrigerating or air-conditioning apparatus, the method comprising using the hermetic electric compressor of claim 8 with a refrigerant having a hydrolfluorocarbon base.